public class p96 {
	public static void main(String args[]) {
	char a[]={'a','b','c','D','E','F'};
	for (int i=0;i<a.length;i++) {
	if(Character.isLowerCase(a[i]))
	a[i]=Character.toUpperCase(a[i]);
	else if(Character.isUpperCase(a[i]))
	a[i]=Character.toLowerCase(a[i]);
	}
	for(int i=0;i<a.length;i++)
	System.out.println("  "+a[i]);
	}
}
